Thread-tension-measuring device



May 29, 1923. lg

J. HUGENTOBLER THREAD TENSION MEASURING DEVICE Filed NOV. 28,-1921 Patented May 29, 1923.

JOHANN HUGENTOBLER, F ST. GALLEN, SWITZERLAND.

THREAD-TENSION1VIEASURING DEVICE.

Application led November 28, 1921.

To el( ywlw/m, t 'may concern.'

Be it known that I, JOHANN HUenN'ros- Lun, a citizen of Switzerland, and residing at St. Gallen, Switzerland, have invented certain new and useful Improvements in Thread-Tension-Measuring Devices, ot which the following is a specification.

The present invention has reference to certain new and useful improvements in devices tor measuring the tension of the shuttle threads in embroidering machines, and it relates more particularly to a device comprising a drop member adapted to house a shuttle and a spring-inliuenced hand or pointer acted on by the shuttle thread and traveling in front of a scale, for indicating the tension of the thread issuing from the shuttle, and I will now proceed to describe my invention in detail in connection with the accompanying drawing, in which Fig. 1 is a front elevation, partly in section, and Fig. 2 a side elevation of the improved thread tension measuring device; Fig. 3 is a section on line A-B--C-D ot Fig. 1; Fig. 4 is a fragmental section on line E-E of Fig. 1, and Fig. 5 a partial section on line F-F of Fig, 1, looking downwardly.

The hollow base frame 1 supports the horizontal plate 2 from which rise the guide pillars 3 and 4 and the standards 5 and 6. At the top these upstanding members are connected by a bridge -piece 7. The pillars and 4 serve as guides for the drop membei' 8, made up o'l two cylindrical weight parts and a cross-piece connecting them, the cylinders being denoted by the numerals 8 and 8 respectively, and the cross-piece by 48. On this latter' is mounted a casing 10 for receiving` a shuttle 9, and a stop ledge 11 against which the shuttle is pressed by a spring 12. To the cross-piece 48 is further secured the beveled ledge 13. The lower end of the guide pillars are extended to form discs 14 and 15 respectively, one of which, for instance 14, is provided with a pin 16 ot truncated cone conformation designed for cooperation with a bore 17 in the respective drop member cylinder, as clearly shown in Fig. 1. This arrangement serves to produce a dead stroke, that is, prevents the drop member from bouncing up again after its fall, Vertical springs 18 for retarding the drop of the drop member are interposed between the latter and the bridge member 7. y Normally the drop member is retained in the inoperative position shown inthe draw- Serial No. 518,174.

ing by a latch member 19 engaging below the beveled edge 13 on the drop member.

This

latch 19 is pivoted to the bracket 2O support. ed on the bridge 7 and is influenced by the lever arm 21, whose one end is likewise pivoted to the bracket 20 and whose other end is linked to the draw rod 22. rllhe lower end of this latter is pivoted to the see saw lever 24 :tulcrumed on one end of a the base plate 2 and whose other end is articulated to a press-button 23 upwardly extending through the base 1, as shown in F ig. 3.

A spring 25 serves to normally keep the press button end in its uppermost positiom'the being such that normally the arrangement latch retains the drop member in the high position. The screw pin 26, which secures the bracket 20 to the bridge 7, carries a thread tensioner 27 for mildly clampingly guiding threads of various thicknesses, to prevent the thread from sluing and backlashing under the sudden operation,

0n the standard 6 is displaceably mounted the U-bracket 30 and a shaft 31 journaled therein carries the pointer 32 (Fig. 4), which latter is provided near its pointed end with a pin 33 and a plate 34 to which is vsecured the end or the shuttle thread 35 yto be drawn out.

To the U- spring is secured.

The other end of this spring is attached to the lower end ot the rocking pointer 32. By more or less rotatA ably displacing the collar 44 with its pin 43 relative to the supporting st tension ot the spring 45 can andard 5 the be altered to take care of ditl'erent shuttle-thread tensions.

The operation of the described parts is as follows: A shuttle 9 is introduced into the housing 10 of the drop member which is held in its uppermost position by the latch 19, the shuttle thread end is drawn out through the tensioning device 27 and is secured tothe upper free end of the pointer by being wound around the pin 33 and the plate 34, the pointer 32 preferably first being swung around in the direction of arrow a (Fig. 1) to a small degree.

The pointer is then swung back into the initial position (Fig. l) in contact with the stop 38, the thread noW being tensioned all over its length,'that is to say from the pointerV end to the point of issue from the shuttle. Next, by pressure on the button 23, the latch 19 is disconnected from the ledge 13 and the drop member, thus released, drops with the shuttle. Hereby, owing to the resistance of spring- 4:5, the shuttle thread 35 is drawn out, provided the resistance in the thread tensioi at the shuttle is not stronger than the resistance oit the spring L15, in which latter case only the pointer-Z would be swung to the lett.

The ratio between thread tension and that of spring a5 will be indicated by the position of the pointer 32 after the tall of the drop member` 8, and, since the spring tension is constant, the thread tension can be read ott" from the position of the pointer, but it 'must be understood, that the pointer does not indicate the thread tension by direct reading,` but only shows the` difference betive'en the thread tension and the stressing of the spring acting` on the pointer.

For adjusting different shuttles to the saine thread tension the mark 4-2 is adjusted to a certain point of the scale 3G (in the illustrated example to 6) and in the inserted shuttle the parts controlling` the thread tension are so adjusted that the pointer 32 with its ypoint coincides Wit-h the line mark i2 ot the shittable marker ,L'O. The

` sharp edges ot the raised portion il of this member, the latter presenting afrespectively oppositely tapering bore in its underitacer in axial alinement with said taper pin, adapted for jamming cooperation therewith on descent of said drop member.

iermit the drop member to drop into the` 10W position; an indicator, comprising a scale and a pointer cooperating With said scale, spring means acting on said pointer and the latter adapted to be acted on by the thread issuing trom the shuttle housed by said drop member.

3. In a device of the character set fort-h, in combination, a frame-Work comprising a base, guide pillars, standards and a crosspiece, a drop member guided yon said pillars and con'iprising tubular Weight members and a bridge member connecting them, a shuttle housing on 'said bridge member, means for normally retaining said drop member in its position and manually operable means for releasing the retaining means to permit the drop member to drop suddenly, means tor producing a dead drop of said drop member; a combined thread guide and tensioner on said frame cross-piece; an indicator mounted on one of said frame standards and comprising a scale plate having graduation marks and a stop, a U-bracket, a pointer rockingly journaled in this U-bracket in front of said scale plate and adapted to register with said graduation marks, thread clamping means near the indicating, upper end of said pointer, a spring, adjustable as to its tension` acting on said pointer, and a shiftable marker on said graduated plate for rselective registry With said graduation marks. ,s

JOHANN HUGENTOBLER. 

